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Thermal lens analysis in a diode-pumped 10 Hz 100 mJ Yb:YAG amplifier

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High power Laser Science and Engineering 2020年第2期8卷 24-31页

作者： Victor Hariton celso paiva joao Hugo pires Mario Galletti Goncalo Figueira GoLp/Instituto de plasmas e Fusao Nuclear Instituto Superior TécnicoUniversidade de LisboaAv.Rovisco Pais1049-001 LisbonPortugal Central Laser Facility Science and Technology Facilities CouncilRutherford Appleton LaboratoryHarwell Science and Innovation CampusDidcot OX110QXUK

We address the power scaling issue in end-pumped laser rod amplifiers by studying,experimentally and numerically,the magnitude of thermal lensing in a high-energy diode-pumped Yb:YAG *** spatio-temporal temperature profile of the gain medium and the focal length of the induced thermal lens are determined *** influence of the repetition rate and pumping power on the temperature distribution is *** measurements covered repetition rates between 1 and 10 Hz and up to 4 kW pumping power.

关键词： diode-pumped lasers high-energy laser amplifiers thermal effects in lasers ytterbium-doped laser media

Using Condensed Water of Air Conditioners for Toilet Flushing： A Case Study in Brazil

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Journal of Civil Engineering and Architecture 2013年第1期7卷 98-104页

作者： celso Silva Bastos joao Luiz Calmon postgraduate program in Civil Engineering Technology Center Federal University of Espirito Santo Vit6ria 29000-000 Brazil

Within the concept of sustainable construction, with sensible and conscious use of finite natural resources, every effort to save and reuse raw-materials is considered an important step to be adopted in buildings, from project, implantation and construction to operation and maintenance throughout their lifecycle. This study aims at showing the application of a system that reuses condensed water drained from air-conditioner evaporators （which are usually disposed of）, and a plan to use this water for toilet flushing, reducing consumption of treated water bought from water companies. The authors verified that each air-conditioner specified in the project of a commercial building--used as reference here--produces 4.8 L of water per hour of operation. This result in a daily accumulated volume of 4,290 L, which represents a significant part of the amount needed to supply all the toilets in the building. A water capture system located at a strategic intermediate floor would be able to store this water and pump it into a special reservoir on the roof of the building, to be distributed into toilet flush pipes. By applying this technology, the authors seek to considerably reduce the expected treated water consumption and consequently decrease water bill costs.

关键词： Water reuse air-conditioner toilet flush.

Increasing analyzable steel thickness for thin layer activation experiments

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Nuclear Science and Techniques 2020年第3期31卷 35-44页

作者： joao Francisco de Oliveira Antunes Mauro Lucio Borges Lemos Michel de Almeida Franca Julio Cezar Suita celso Marcelo Franklin Lapa Instituto de Engenharia Nuclear Rio de Janeiro 21941-614Brazil programa de Engenharia Nuclear-COppE/UFRJ Riode Janeiro 21941-450Brazil

The thin layer activation technique(TLA)is very effective in wear analysis for tribological systems where disassembly is costly or *** its development in the 1970s,TLA has been applied through direct irradiation of solid targets using ionizing particle beams to obtain an activation with a specific *** profile is then used to measure wear in a variety of *** experiments rely heavily on how deep the normalized activation *** of 30μm to 50μm are obtained for constant activation by the standard method,which for many experiments is ***,many others would benefit greatly from a 300μm constant activation layer,such as high-performance engines,softer alloys(brakes),and oil transport *** this aim was the goal of this ***,we needed to find an adequate irradiation line for the TLA ***,another technique/system was developed(the Attenuation Wheel),which would bring the depth of constant activation from 50μm to 300μm.

关键词： Thin layer activation Wear proton beam Attenuation wheel

High efficiency second harmonic generation of nanojoule-level femtosecond pulses in the visible based on BiBO

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High power Laser Science and Engineering 2019年第1期7卷 82-89页

作者： Mario Galletti Hugo pires Victor Hariton celso paiva joao Swen Künzel Marco Galimberti Goncalo Figueira GoLp/Instituto de plasmas e Fusao Nuclear Instituto Superior Técnico Universidade de Lisboa Central Laser Facility Science and Technology Facilities Council Rutherford Appleton Laboratory Harwell Science and Innovation Campus

We demonstrate high efficiency second harmonic generation(SHG) of near infrared femtosecond pulses using a BiB3 O6 crystal in a single-pass tight focusing geometry setup. A frequency doubling efficiency of 63% is achieved, which is,to the best of our knowledge, the highest value ever reported in the femtosecond regime for such low energy(nJ-level)pumping pulses. Theoretical analyses of the pumping scheme focusing waist and the SHG efficiency are performed, by numerically solving the three wave mixing coupled equations in the plane-wave scenario and by running simulations with a commercial full 3 D code. Simulations show a good agreement with the experimental data regarding both the efficiency and the pulse spectral profile. The simulated SHG pulse temporal profile presents the characteristic features of the group velocity mismatch broadening in a ‘thick' crystal.

关键词： nonlinear process second harmonic generation pumping scheme parametric amplification/oscillators high power laser

Structural and nucleic acid binding properties of hepatitis delta virus small antigen

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World Journal of Virology 2017年第2期6卷 26-35页

作者： Carolina Alves Hong Cheng joao paulo Tavanez Ana Casaca Severin Gudima Heinrich Roder celso Cunha Global Health and Tropical Medicine GHTMInstituto de Higiene e Medicina Tropical IHMTUniversidade Nova de Lisboa Institute for Cancer Research Fox Chase Cancer Center Global Health and Tropical Medicine GHTM Instituto de Higiene e Medicina Tropical IHMT Universidade Nova de Lisboa Department of Microbiology Molecular Genetics and ImmunologyKansas University Medical Center

AIM To further characterize the structure and nucleic acid binding properties of the 195 amino acid small delta antigen, S-HDAg, a study was made of a truncated form of S-HDAg, comprising amino acids 61-195(?60HDAg), thus lacking the domain considered necessary for dimerization and higher order *** Circular dichroism, and nuclear magnetic resonance experiments were used to assess the structure of ?60HDAg. Nucleic acid binding properties were investigated by gel retardation assays. RESULTS Results showed that the truncated ?60HDAg protein is intrinsically disordered but compact, whereas the RNA binding domain, comprising residues 94-146, adopts a dynamic helical conformation. We also found that ?60HDAg fails to multimerize but still contains nucleic acid binding activity, indicating that multimerization is not essential for nucleic acid binding. Moreover, in agreement with what has been previously reported for full-length protein, no apparent specificity was found for the truncated protein regarding nucleic acid *** Taken together these results allowed concluding that ?60HDAg is intrinsically disordered but compact; ?60HDAg is not a multimer but is still capable of nucleic acid binding albeit without apparent specificity.

关键词： Hepatitis delta virus Delta antigen Nuclear magnetic resonance Circular dichroism Intrinsically disordered protein

Urban forest loss using a GIS-based approach and instruments for integrated urban planning:A case study of Jo?o pessoa,Brazil

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Journal of Geographical Sciences 2021年第10期31卷 1529-1552页

作者： Leandro Ismael de Azevedo LACERDA JoséAugusto Ribeiro da SILVEIRA celso Augusto Guimarães SANTOS Richarde Marques da SILVA Alexandro Medeiros SILVA Thiago Victor Medeiros do NASCIMENTO Edson Leite RIBEIRO paulo Vitor Nascimento de FREITAS Federal University of paraíba Laboratory of Urban and Built Environment-LAURBE58051-900 João PessoaParaíbaBrazil Federal University of paraíba Department of Architecture and Urbanism58051-900 João PessoaPBBrazil Federal University of paraíba Department of Civil and Environmental Engineering58051-900 João PessoaPBBrazil Federal University of paraíba Department of Geosciences58051-900 João PessoaPBBrazil Ministry of Cities Setor de Autarquias SulQuadra 01Lote 01/06Bloco HEd.Telemundi II70070-010 BrasíliaDFBrazil

Urban forests play an important role in the thermal comfort and overall life of local populations in large-and medium-sized *** study analyzes urban forest loss and maps land use and land cover(LULC)changes between 1991 and 2018 by evaluating the use of urban planning instruments for the mitigation of urban forest loss in Jo?o pessoa,*** this purpose,satellite-derived LULC images from 1991,2006,2010 and 2018 and data on urban forest loss areas obtained using the Google Earth Engine were *** addition,this paper also discusses the instruments used for integrated urban planning,which are(a)the legal sector,responsibility and nature;(b)the urban expansion process;and(c)the elements of urban *** results show a clear shift in land use in the study *** major changes in LULC classes occurred in urban areas and herbaceous vegetation,while the greatest loss was in arboreal/shrub ***,an increase in the pressure to occupy zones intended for environmental preservation could be *** results showed similar accuracies with other studies and more spatial *** characteristics of the patterns,traces,and hotspots of urban expansion and forest cover loss were *** highlighted the potential use of this proposed framework to be applied and validated in other parts of the world to help better understand and quantify various aspects of urban-related problems such as urban forest loss mapping using instruments for integrated urban planning and low-cost approaches.

关键词： integrated planning mapping thematic synthesis urban afforestation urban planning

Comparison of Self-levelling Underlayment to Traditional Methods Used in Brazil

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Journal of Civil Engineering and Architecture 2019年第6期13卷 373-380页

作者： Guilherme Figliuzzi Elaine Vazquez Justino Nobrega joao dos Santos Lais Alves Department of Civil Engineering Federal Center of Technological Education Celso Suckow da FonsecaBrazil Department of Civil Construction Federal University of Rio de JaneiroRio de JaneiroRJ21941-909Brazil DVSST Department Post Graduate Studies on Safety EngineeringFederal University of Rio de JaneiroRio de JaneiroRJ21941-909Brazil Department of Civil Engineering Federal Center of Technological Education Celso Suckow da FonsecaBrazil Department of Civil Engineering Federal Center of Technological Education Celso Suckow da FonsecaRio de JaneiroRJ20271-110Brazil

Between 2005 and 2015,the Brazilian real estate market experienced strong growth,driven by the stable scenario of the Brazilian economy and policies to encourage real estate *** this demand,the companies of the sector sought to be more competitive in the *** of the measures adopted is the search for more efficient executive *** the traditional manual methodology for underlayment predominates in the country’s construction sites,a self-levelling underlayment presents a tendency towards mechanization of executive construction *** paper aims to present a case study of a residential construction in Rio de Janeiro,which used self-levelling underlayment *** regarding cost and productivity of both methodologies were made to evaluate the viability of the self-levelling underlayment in future construction *** obtained from other constructions were used to estimate the productivity and cost of the traditional underlayment *** results demonstrate that the use of self-levelling underlayment has potential to be widespread and used in the constructions in Brazil.

关键词： Traditional levelling underlayment self-levelling underlayment cost productivity

Refining the Stratigraphy of the Taghdout Group by Using the U-pb Geochronology of the Taghdout Sill(Zenaga inlier,Anti-Atlas,Morocco)

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Acta Geologica Sinica(English Edition) 2016年第S1期90卷 1-页

作者： Abdelhak AIT LAHNA Colombo celso Gaeta TASSINARI Nasrrddine YOUBI Hassan ADMOU joao MATA El Hafid BOUOUGRI Latifa CHAIB Richard E.ERNST Ulf SODERLUND Moulay Ahmed BOUMEHDI Mohamed Khalil BENSALAH El Mostapha AARAB Department of Geology Faculty of Sciences-SemlaliaCadi Ayyad University Centro de pesquisas Geocronológicas(CpGeo) Instituto de Geociencias(IG)Universidade de Sao Paulo-USP Instituto Dom Luiz Faculdade de CiênciasUniversidade de Lisboa Department of Earth Sciences Carleton University Department of Geology Lund University

The Anti-Atlas belt of southern Morocco is situated on the northern edge of the West African craton(WAC).It corresponds to a broad anticlinorium some 800 km long and 200 km wide,trending ENE-WSW,parallel to the

关键词： pb Zenaga inlier Morocco Refining the Stratigraphy of the Taghdout Group by Using the U-pb Geochronology of the Taghdout Sill Anti-Atlas

Calibration of Hargreaves-Samani Equation for Estimating Reference Evapotranspiration in Sub-Humid Region of Brazil

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Journal of Water Resource and protection 2013年第12期5卷 1-5页

作者： José Romualdo de Sousa Lima Antonio celso Dantas Antonino Eduardo Soares de Souza Claude Hammecker Suzana Maria Gico Lima Montenegro Carlos Alberto Brayner de Oliveira Lira Academic Unity of Garanhuns Federal Rural University of Pernambuco Garanhuns Brazil Academic Unity of Serra Talhada Federal Rural University of Pernambuco Serra Talhada Brazil Land Development Department Office of Science for Land Development IRD Montpellier France Nuclear Energy Department Federal University of Pernambuco Recife Brazil

Reference evapotranspiration (ETo) is an important parameter used in numerous applications, such as climatological and hydrological studies, as well as for water resources planning and management. There are several methods to estimate ETo, being that the FAO penman-Monteith (ETopM) method is considered standard. This method needs many parameters (solar radiation, air temperature, humidity and wind speed), however there are still many uncovered areas, suggesting the need for methods of calculating evapotranspiration based on few meteorological elements, such as air temperature. Therefore, this study aimed to determine the ETo by Hargreaves-Samani method in the experimental watershed of the “Riacho do papagaio” farm, in county of Sao joao, in north-eastern Brazil, using data of 2011 and 2012. Reference evapotranspiration estimated by non-calibrated Hargreaves-Samani method (EToHS) was overestimated in all months (RMSE = 1.43 mm·d-1), mainly in months of lower evaporative demand (from May to July). Because of these tendencies, this method cannot be used in its original form to estimate ET for this region;therefore, a calibration of radiation adjustment coefficient (kRs) was performed. The calibrated Hargreaves-Samani method (EToHSc) had better performance (RMSE = 0.52 mm·d-1), being suitable for predicting ETo in this region.

关键词： Reference Evapotranspiration penman-Monteith Hargreaves-Samani Air Temperature